In a previous life I worked for a DC8-62F operator, DC8-62's that were (supposedly) Stage 3 hushkitted and compliant, but just try taking off from such an airport as LGW at MTOW and remaining Stage 3!
The noise reporting points are indicated on the aerodrome plates, all we did was throttle back as we passed over the reporting point(s) before opening up the throttles again.
It's a nonsense
